To help Sherry.
How this model works: There's a Gland X that produces (creates) hormone A and hormone B with equal chance. Hormone A and B are released by Gland X and when hormone B collides with Gland X, there's a chance of 1 in 20 that the production of hormone A is being stopped. I added the likelihood to add some randomness to the model while having more time the gland creating hormone A to see it more clearly on the graph. The direction in which Gland X releases hormones can be controlled by the direction arrows on the keyboard. There's a parameter to control the size of hormone A units.